Article

Digestibility in Lactating Cows of Diets Containing Whole Pima Treated with Sodium Hydroxide Versus Akala or Pima Cottonseed

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Abstract

This study examines the effect of NaOH treatment on the nutritive value of Pima cottonseed for lactating cows. Treatment of Pima cottonseed with NaOH increased the extent of dry matter (DM) and neutral detergent fiber in vitro digestibility. Three groups of cows were fed 3 similar total mixed rations (TMR) differing only in the type of cottonseed fed, either whole linted Akala, whole unlinted Pima, or whole Pima treated with 4% NaOH (T-Pima). Dry matter and organic matter (OM) intakes of Akala and Pima TMR were similar and tended to be lower compared with cows fed T-Pima. This was reflected in similar intake of crude protein and lipids by cows fed the 3 TMR. Digestibility of DM, OM, and crude protein were similar in cows fed Pima and T-Pima diets, and slightly higher in cows fed the Akala TMR. Lipid digestibility was highest in cows fed Akala TMR, whereas cellulose and NDF digestibility were lowest in Pima TMR. In the 3 TMR, there was a large gap between the high values of "digestibility of intact seeds" and actual in vivo digestion of DM and OM. Similar yields of milk and milk protein were obtained in cows fed the Akala and Pima TMR, whereas higher yields of milk, milk protein, milk fat, and 4% fat-corrected milk were found in the T-Pima cows. Similar efficiency of DM intake for fat-corrected milk production was achieved by cows fed the 3 TMR.

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... On the other hand, alkalization is conducive to breaking the links between hemicellulose and lignin in cottonseed conchiolin and swells cottonseed hulls. The cotton kernel and hull NDF polysaccharides are generally more accessible to rumen microorganisms, and the alkaline hydrolysis of cellulose enhances the degradation of WCS nutrients (25). It supported our study that the WCS treated with the combination method of crush and alkalization could increase the rumen digestibility of NDF and ADF when compared with only crushed treatment and non-processed WCS. ...
... In the present study, we found that CA2 processing methods significantly improved the DMI of dairy cows. This result was in line with previous studies that showed alkalized cottonseed increased 2 kg DMI (25), promoted the ruminal degradation of NDF and ADF, and enhanced the feeding frequency and nutrient intake of cows (30) when compared with unprocessed WCS. It also coincided with the results in our study that WCS nutrients in situ rumen degradation and in vitro intestinal digestion were increased. ...
... It also coincided with the results in our study that WCS nutrients in situ rumen degradation and in vitro intestinal digestion were increased. Additionally, our results suggested that the higher NDF digestibility may result in the higher milk fat and 4% FCM of the CA2 group due to the improvement of FA biosynthesis in milk and milk production, which was consistent with the study of Solomon, Adin, Mabjeesh, Nikbachat, Yosef, Ben-Ghedalia and Miron (25). For the milk fat composition, we found the CA2 group had a higher level content of C18:2 FA than the other two groups, which could be explained by the consequence of a higher rate of ruminal fat protection of CA2 treated WCS compared with non-processed WCS, thereby decreasing the efficiency of biohydrogenation in the rumen and increasing the proportion of C18:2 leaving the rumen (31). ...
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... Because Gossypium barbadense cottonseed possesses almost no linters, it is digested differently by cattle than G. hirsutum. The nearly naked seeds are thought to sink in the rumen and so be less masticated and digested (Coppock et al., 1985;Sullivan et al., 1993aSullivan et al., , 1993bZinn, 1995;Solomon et al., 2005). To improve digestibility of G. barbadense seed it is often cracked prior to feeding even though this increases the exposure to gossypol. ...
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A review of the biology and taxonomy of Gossypium, with emphasis on agriculture.
... One possible explanation for the low effect of in vitro TMR digestibility on ECM yield (Table 3) is that the higher DM and NDF voluntary intake by cows fed the EXP TMR increased, in turn, the passage rate of particles and NDF from the rumen, causing a reduced rate and extent of NDF digestion along the gastrointestinal tract (Van Soest, 1994;NRC, 2001). Similar findings have been documented in previous studies that compared various diets differing in their potential in vitro DM digestibility, where a great effect on voluntary DMI was observed, but with little influence on milk production efficiency (Solomon et al., 2005;Miron et al., 2004a and2004b). ...
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... The percentage of consumed seeds recovered in feces was higher with Pima (Sullivan et al., 1993) and tended to be higher for delinted CS (Moreira et al., 2004), which might indicate lower fat digestibility. Recently, Solomon et al. (2005) discussed the possibility that lower ether extract digestibility for Pima seeds might result from passage of intact fragments of seeds or from ruminal escape of triglycerides that might be more poorly absorbed than FA. Therefore, it is not known if FA digestibility of delinted CS would be lower than that of WCS. ...
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Delinted cottonseed improves lactation response
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